10/01/2012 at 09:00 AM EDT
knows how to stay warm.
"My 55 pound blanket," the actress Tweeted
last week in her regular photo post series, #TuesdayswithTina.
In the photo, Biel is seemingly asleep on a sofa, and her beloved pit bull is, too – right on top of Biel.
Since joining the social media site in May, Biel has given Tina lots of Tweet time, and the dog's big personality has definitely come through.
"Tina's staring at me," Biel Tweeted
last month. "Judging me."